Diaphragm



oct. 2, 1923. 1,469,763

.N. H. SNYDER ET AL DIAPHRAGM Original Filed Nov. 15 1920 Warn 72 5 7 der* an FaQ/E045' Patented ocez, `192:5.-

UNITED STATES WARD E. SNYDEB AND FRANK F. FArBKAS, F CHICAGO,

ILLINGI maranacm.

Original application illed November 15, 1920, Serial No. 424,080. Divided andthia application illed .lo-y

' vemberr, 1922. Serial No. 599,193.

To all whom'itmay concern.'

Be it known that we, vWann H.' SNYDEB and FRANK F. Famms, citizens of the United States, residin at Chicago, in the county of Cook and tate of Illinois, have inventedY certain new and useful Improve-` ments in a Diaphragm, of which the following is a specifications Our present application constitutes a division of certain subject-matter first set forth in our pending application for United States Letters. Patent for Shutter controllin mechanism, "filed November 15, 1920, i erial No. 494080 and relates to im provements in diaphragms. Diaphragms, as used in4 this connection are instruments for controlling the passage of light and are highly desirable, if not necessary, elements 1n photography and optics in general. The amount of light which reaches a particular locality or area depends upon the distance of the area or location from the source "of illumination, which, so far as the present problem is concerned, is the means of light control, or the diaphragm itself, the extent to which the diap 0 hra m is opened, or better still the` relation etween the extent of the diaphragm openingy and the distance between the opening an the area under illumination, and the time during which the location or area is exposed to illumination. These three circumstances bear to each other the relation of factors' that is no change can be made in either of them without working definite and exact changes in the other two.

The objects of the invention herein described are to provide a simple adjustable dixaghragm which may be economically m e and distributed, at an economical price, and which is provided with two oontrols capable of being operated either independently or together, and the operation of which, by the employment of suitable indicia, may be related in the ratio of the time and diaphragm opening factors above alluded to. We attain the foregoing ob-A jects by means of the structure illustrated in the accompanying drawin in which- Fig. 1 shows one use tion may be put and is ,an elevation of a front or lens board of a camera with our im roved diaphragm mounted thereon;

to w ich our inven-` Fig. 2 is a schematic fragmental detail showing a diaphragm blade or leaf and the relation of the control elements thereto.

Similar reference characters refer to similar parts in the respective views.

The diaphragm comprises a plurality of arcuate or lune shaped blades or leaves 3 and two apertured elements preferabl in the form of circular or disk shaped p ates 4 and 5, the said plates being each provided with a central circular aperture 4' and 5l respectively. One of the apertured elements, say plate 4 has' radial slots or castellations 4 extending outwardly from the central aperture. Each blade 3 is ivoted b a suitable pin 3 to plate 5, an at the ot er end is provided with a lateral pin 3" which enters a slot or castellation 4" in plate 4.

The plates and blades assembled as above described, the plates are, respectively, provided with arms 4" and 5 for more conveniently rotating them and the disks are mounted in any suitable manner to ermt of rotation. This may be simply one by providin a centrally apertured disk 6 from the e ge or perimeter of which extend tongues or tangs 6. The assembled disks 4 and 5 and blades 3 are laid upon disk 6 and tongues or tangs 6 `are bent up and around the topmost disk.

FromV the fore oin description, taken in connection wit t e drawing, vit will now be apparent that the rotation of either plate 4 or 5 will cause the respective blades to be either drawn toward or retiredhom the center of the structure according to the direction of the relative motion between plates 4 and 5.

lates 4 and 5'may be operated either inependently or together which permits of their movements being of the factors of time and dlaphragmms herein alluded to.

What'we claim new is:

1. In a camera., a diaphragm having leaves, and two independently adjustable controlling elements; said leaves being subject to the joint control of said controlling elements.

2. A camera having a diaphragm having leaves and two independently rotatable rings, the leaves being pivoted at one end to one of the' rings and aat the opposite end conrelated in the ratio It will also be seen that A `conne '4. A diaphragm comprising two rotatable asertuned plates, a plurality of blades ivote at one endin spaced nelationto an conf centrically of'the' aperture of one of 1said plates,`the other of said plates bein provided with a. series of concentrica y 'arran s aced slots, and means upon the unsecured) ends of said blades for engaging Said iloa h 'l ced 5. iap ragm comprising spa 1 apertured revoluble elements, and a\pluralit of blades interposed between said elements having a pivotal engagement at one end with one of said elements, and a slidn and pivotal engagement at the other en with the other of said elements.

6. A diaphr consisting of a air of apertured elements rotatable aboutA common axis and aplurality of blades movably at their opposite ends to said respective elements, whereby the relative movement of said elements moves said blades toward or away from the axis of said ele-` ments.

7. A diaphragm comprising two rotatable a. rtured lates and .a lurality ofblades 5h @agay comms m bother sind mon axis, and a plurality of blades each movably connected to both of said elements' whereby the relative movement of said elements moves said blades toward or a'way from Athedaxi,1 of said elements.

9. iap ragm comprisi mountin means, a plurality of blades mdvgably moun edtvith respect to said means, and a plu-` rality of control elements each operatively connected with all of said blades whereby a /relatve movement between said control elements changes the positions of Vthe said blades.

10. A diaphragm 'cemprisi 'mounting means, a plurality of movable lades associa-ted therewith and a plurality of independently operable .control elements each suitably connected with all of said blades wherebya relative movement between said control elements simultaneously changes the .positions of said blades.

o, county of Cook, and

` Signed a-t Chi State of Illinois, t 'sl 31st day of October,

WARD H. SNYDER.

Fmamvca .coV

FRANK F. FARKAS.;- 

